Helium gas is used in gas balloons instead of hydrogen gas because it is A. Lighter than hydrogen B. More abundant than hydrogen C. Non-combustible D. More stable

The correct answer is: Helium gas is used in gas balloons instead of hydrogen gas because it is lighter than hydrogen.

Hydrogen is lighter than air, but it is also highly flammable. Helium is also lighter than air, but it is non-flammable. This makes helium a much safer choice for use in gas balloons.

Here is a brief explanation of each option:

• Option A: Helium is lighter than hydrogen. This means that a balloon filled with helium will float higher than a balloon filled with hydrogen.
• Option B: Hydrogen is more abundant than helium. However, hydrogen is also highly flammable, which makes it a dangerous choice for use in gas balloons.
• Option C: Helium is non-combustible. This means that it will not burn, even if it comes into contact with a flame.
• Option D: Helium is more stable than hydrogen. This means that it is less likely to react with other substances.

I hope this helps!